package cn.tedu.v3;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 * Version 3.0 升级 双向链接【客户端与服务器相互说话】
 *
 * 优化：代码结构、流没有关闭
 */
public class Server {
    private ServerSocket serverSocket;
    public Server() {
        try {
            serverSocket=new ServerSocket(6666);
        }catch(BindException e) {
            System.out.println("端口号重复出申请，建议换个端口号");
        }catch (IOException e) {
            System.out.println("申请端口号失败....");
        }
    }
    public void start() {
        try {
            while(true) {

                System.out.println("----等待客户端链接-----");
                Socket socket = serverSocket.accept();

                String ip = socket.getInetAddress().getHostAddress();
                System.out.println(ip + "一个客户端链接成功了");

                new Thread(new CS(socket)).start();
            }
        } catch (IOException e) {
            System.out.println("服务器端通讯断开了");
        } finally {
              if (serverSocket!=null&&!serverSocket.isClosed()){
                  try {
                      serverSocket.close();
                  } catch (IOException e) {
                      System.out.println("服务器关闭失败");
                  }
              }

        }

    }
    public static void main(String[] args) throws IOException {
        new Server().start();
    }
    private class CS implements Runnable{
        private Socket socket;
        private String ip;
        public CS(Socket s){
            this.socket=s;
            ip = socket.getInetAddress().getHostAddress();
        }
        public void run() {
            PrintWriter pw = null;
           // BufferedReader br=null;

            try {
                //1.读入定义
               BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
                //2.定义写出
                 pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF8")), true);
                //1.1 读入功能：存线程中
                new Thread(() -> {
                    String message;
                    try {
                        while ((message = br.readLine()) != null) {
                            System.out.println("客户端说：" + message);
                            //增加写出一句话：读完卡住等待输入
                            System.out.println("服务器端请输入：");
                        }
                    } catch (IOException e) {
                        System.out.println("客户端读入失败");
                    }
                }).start();
                //2.1
                Scanner input=new Scanner(System.in);//控制台卡住
                while (true){
                    System.out.println("服务器请输入");
                    String say=input.nextLine();//得到控制台输入值
                    //打印：服务器端说的文本---打印客户端
                    pw.println("服务器说："+say);
                }
            } catch (NullPointerException e) {
                System.out.println("IO 流传入对象，" +
                        "有对象为null!立马核对，" +
                        "建议：查看try块中对象可能赋值为null");
            } catch (UnsupportedEncodingException e) {
                System.out.println("客户端或者服务器端：字符集不一致");
            } catch (IOException e) {
                System.out.println("通讯过程中，传输出现错误！");
            } finally {
             /*   if (br!= null)
                    try {
                        br.close();
                    } catch (IOException e) {
                        System.out.println("结束通讯：关闭失败！");
                    }*/
                if (socket != null && !socket.isClosed()) {
                    try {
                        socket.close();
                    } catch (IOException e) {
                        System.out.println("通讯关闭失败");
                    }
                }
            }

        }

    }
}